Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 552 insertions, 0 deletions

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
new file mode 100644
index 0000000..86c4d01
--- /dev/null
+++ b/drivers/i2c/i2c-dev.c
@@ -0,0 +1,552 @@
+/*
+    i2c-dev.c - i2c-bus driver, char device interface  
+
+    Copyright (C) 1995-97 Simon G. Vogl
+    Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
+    Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/* Note that this is a complete rewrite of Simon Vogl's i2c-dev module.
+   But I have used so much of his original code and ideas that it seems
+   only fair to recognize him as co-author -- Frodo */
+
+/* The I2C_RDWR ioctl code is written by Kolja Waschk <waschk@telos.de> */
+
+/* The devfs code is contributed by Philipp Matthias Hahn 
+   <pmhahn@titan.lahn.de> */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <asm/uaccess.h>
+
+static struct i2c_client i2cdev_client_template;
+
+struct i2c_dev {
+	int minor;
+	struct i2c_adapter *adap;
+	struct class_device class_dev;
+	struct completion released;	/* FIXME, we need a class_device_unregister() */
+};
+#define to_i2c_dev(d) container_of(d, struct i2c_dev, class_dev)
+
+#define I2C_MINORS	256
+static struct i2c_dev *i2c_dev_array[I2C_MINORS];
+static DEFINE_SPINLOCK(i2c_dev_array_lock);
+
+static struct i2c_dev *i2c_dev_get_by_minor(unsigned index)
+{
+	struct i2c_dev *i2c_dev;
+
+	spin_lock(&i2c_dev_array_lock);
+	i2c_dev = i2c_dev_array[index];
+	spin_unlock(&i2c_dev_array_lock);
+	return i2c_dev;
+}
+
+static struct i2c_dev *i2c_dev_get_by_adapter(struct i2c_adapter *adap)
+{
+	struct i2c_dev *i2c_dev = NULL;
+
+	spin_lock(&i2c_dev_array_lock);
+	if ((i2c_dev_array[adap->nr]) &&
+	    (i2c_dev_array[adap->nr]->adap == adap))
+		i2c_dev = i2c_dev_array[adap->nr];
+	spin_unlock(&i2c_dev_array_lock);
+	return i2c_dev;
+}
+
+static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap)
+{
+	struct i2c_dev *i2c_dev;
+
+	i2c_dev = kmalloc(sizeof(*i2c_dev), GFP_KERNEL);
+	if (!i2c_dev)
+		return ERR_PTR(-ENOMEM);
+	memset(i2c_dev, 0x00, sizeof(*i2c_dev));
+
+	spin_lock(&i2c_dev_array_lock);
+	if (i2c_dev_array[adap->nr]) {
+		spin_unlock(&i2c_dev_array_lock);
+		dev_err(&adap->dev, "i2c-dev already has a device assigned to this adapter\n");
+		goto error;
+	}
+	i2c_dev->minor = adap->nr;
+	i2c_dev_array[adap->nr] = i2c_dev;
+	spin_unlock(&i2c_dev_array_lock);
+	return i2c_dev;
+error:
+	kfree(i2c_dev);
+	return ERR_PTR(-ENODEV);
+}
+
+static void return_i2c_dev(struct i2c_dev *i2c_dev)
+{
+	spin_lock(&i2c_dev_array_lock);
+	i2c_dev_array[i2c_dev->minor] = NULL;
+	spin_unlock(&i2c_dev_array_lock);
+}
+
+static ssize_t show_adapter_name(struct class_device *class_dev, char *buf)
+{
+	struct i2c_dev *i2c_dev = to_i2c_dev(class_dev);
+	return sprintf(buf, "%s\n", i2c_dev->adap->name);
+}
+static CLASS_DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
+
+static ssize_t i2cdev_read (struct file *file, char __user *buf, size_t count,
+                            loff_t *offset)
+{
+	char *tmp;
+	int ret;
+
+	struct i2c_client *client = (struct i2c_client *)file->private_data;
+
+	if (count > 8192)
+		count = 8192;
+
+	tmp = kmalloc(count,GFP_KERNEL);
+	if (tmp==NULL)
+		return -ENOMEM;
+
+	pr_debug("i2c-dev: i2c-%d reading %zd bytes.\n",
+		iminor(file->f_dentry->d_inode), count);
+
+	ret = i2c_master_recv(client,tmp,count);
+	if (ret >= 0)
+		ret = copy_to_user(buf,tmp,count)?-EFAULT:ret;
+	kfree(tmp);
+	return ret;
+}
+
+static ssize_t i2cdev_write (struct file *file, const char __user *buf, size_t count,
+                             loff_t *offset)
+{
+	int ret;
+	char *tmp;
+	struct i2c_client *client = (struct i2c_client *)file->private_data;
+
+	if (count > 8192)
+		count = 8192;
+
+	tmp = kmalloc(count,GFP_KERNEL);
+	if (tmp==NULL)
+		return -ENOMEM;
+	if (copy_from_user(tmp,buf,count)) {
+		kfree(tmp);
+		return -EFAULT;
+	}
+
+	pr_debug("i2c-dev: i2c-%d writing %zd bytes.\n",
+		iminor(file->f_dentry->d_inode), count);
+
+	ret = i2c_master_send(client,tmp,count);
+	kfree(tmp);
+	return ret;
+}
+
+static int i2cdev_ioctl(struct inode *inode, struct file *file,
+		unsigned int cmd, unsigned long arg)
+{
+	struct i2c_client *client = (struct i2c_client *)file->private_data;
+	struct i2c_rdwr_ioctl_data rdwr_arg;
+	struct i2c_smbus_ioctl_data data_arg;
+	union i2c_smbus_data temp;
+	struct i2c_msg *rdwr_pa;
+	u8 __user **data_ptrs;
+	int i,datasize,res;
+	unsigned long funcs;
+
+	dev_dbg(&client->adapter->dev, "i2c-%d ioctl, cmd: 0x%x, arg: %lx.\n",
+		iminor(inode),cmd, arg);
+
+	switch ( cmd ) {
+	case I2C_SLAVE:
+	case I2C_SLAVE_FORCE:
+		if ((arg > 0x3ff) || 
+		    (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f))
+			return -EINVAL;
+		if ((cmd == I2C_SLAVE) && i2c_check_addr(client->adapter,arg))
+			return -EBUSY;
+		client->addr = arg;
+		return 0;
+	case I2C_TENBIT:
+		if (arg)
+			client->flags |= I2C_M_TEN;
+		else
+			client->flags &= ~I2C_M_TEN;
+		return 0;
+	case I2C_PEC:
+		if (arg)
+			client->flags |= I2C_CLIENT_PEC;
+		else
+			client->flags &= ~I2C_CLIENT_PEC;
+		return 0;
+	case I2C_FUNCS:
+		funcs = i2c_get_functionality(client->adapter);
+		return (copy_to_user((unsigned long __user *)arg, &funcs,
+		                     sizeof(unsigned long)))?-EFAULT:0;
+
+	case I2C_RDWR:
+		if (copy_from_user(&rdwr_arg, 
+				   (struct i2c_rdwr_ioctl_data __user *)arg, 
+				   sizeof(rdwr_arg)))
+			return -EFAULT;
+
+		/* Put an arbritrary limit on the number of messages that can
+		 * be sent at once */
+		if (rdwr_arg.nmsgs > I2C_RDRW_IOCTL_MAX_MSGS)
+			return -EINVAL;
+		
+		rdwr_pa = (struct i2c_msg *)
+			kmalloc(rdwr_arg.nmsgs * sizeof(struct i2c_msg), 
+			GFP_KERNEL);
+
+		if (rdwr_pa == NULL) return -ENOMEM;
+
+		if (copy_from_user(rdwr_pa, rdwr_arg.msgs,
+				   rdwr_arg.nmsgs * sizeof(struct i2c_msg))) {
+			kfree(rdwr_pa);
+			return -EFAULT;
+		}
+
+		data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL);
+		if (data_ptrs == NULL) {
+			kfree(rdwr_pa);
+			return -ENOMEM;
+		}
+
+		res = 0;
+		for( i=0; i<rdwr_arg.nmsgs; i++ ) {
+			/* Limit the size of the message to a sane amount */
+			if (rdwr_pa[i].len > 8192) {
+				res = -EINVAL;
+				break;
+			}
+			data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf;
+			rdwr_pa[i].buf = kmalloc(rdwr_pa[i].len, GFP_KERNEL);
+			if(rdwr_pa[i].buf == NULL) {
+				res = -ENOMEM;
+				break;
+			}
+			if(copy_from_user(rdwr_pa[i].buf,
+				data_ptrs[i],
+				rdwr_pa[i].len)) {
+					++i; /* Needs to be kfreed too */
+					res = -EFAULT;
+				break;
+			}
+		}
+		if (res < 0) {
+			int j;
+			for (j = 0; j < i; ++j)
+				kfree(rdwr_pa[j].buf);
+			kfree(data_ptrs);
+			kfree(rdwr_pa);
+			return res;
+		}
+
+		res = i2c_transfer(client->adapter,
+			rdwr_pa,
+			rdwr_arg.nmsgs);
+		while(i-- > 0) {
+			if( res>=0 && (rdwr_pa[i].flags & I2C_M_RD)) {
+				if(copy_to_user(
+					data_ptrs[i],
+					rdwr_pa[i].buf,
+					rdwr_pa[i].len)) {
+					res = -EFAULT;
+				}
+			}
+			kfree(rdwr_pa[i].buf);
+		}
+		kfree(data_ptrs);
+		kfree(rdwr_pa);
+		return res;
+
+	case I2C_SMBUS:
+		if (copy_from_user(&data_arg,
+		                   (struct i2c_smbus_ioctl_data __user *) arg,
+		                   sizeof(struct i2c_smbus_ioctl_data)))
+			return -EFAULT;
+		if ((data_arg.size != I2C_SMBUS_BYTE) && 
+		    (data_arg.size != I2C_SMBUS_QUICK) &&
+		    (data_arg.size != I2C_SMBUS_BYTE_DATA) && 
+		    (data_arg.size != I2C_SMBUS_WORD_DATA) &&
+		    (data_arg.size != I2C_SMBUS_PROC_CALL) &&
+		    (data_arg.size != I2C_SMBUS_BLOCK_DATA) &&
+		    (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) &&
+		    (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) {
+			dev_dbg(&client->adapter->dev,
+				"size out of range (%x) in ioctl I2C_SMBUS.\n",
+				data_arg.size);
+			return -EINVAL;
+		}
+		/* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1, 
+		   so the check is valid if size==I2C_SMBUS_QUICK too. */
+		if ((data_arg.read_write != I2C_SMBUS_READ) && 
+		    (data_arg.read_write != I2C_SMBUS_WRITE)) {
+			dev_dbg(&client->adapter->dev, 
+				"read_write out of range (%x) in ioctl I2C_SMBUS.\n",
+				data_arg.read_write);
+			return -EINVAL;
+		}
+
+		/* Note that command values are always valid! */
+
+		if ((data_arg.size == I2C_SMBUS_QUICK) ||
+		    ((data_arg.size == I2C_SMBUS_BYTE) && 
+		    (data_arg.read_write == I2C_SMBUS_WRITE)))
+			/* These are special: we do not use data */
+			return i2c_smbus_xfer(client->adapter, client->addr,
+					      client->flags,
+					      data_arg.read_write,
+					      data_arg.command,
+					      data_arg.size, NULL);
+
+		if (data_arg.data == NULL) {
+			dev_dbg(&client->adapter->dev,
+				"data is NULL pointer in ioctl I2C_SMBUS.\n");
+			return -EINVAL;
+		}
+
+		if ((data_arg.size == I2C_SMBUS_BYTE_DATA) ||
+		    (data_arg.size == I2C_SMBUS_BYTE))
+			datasize = sizeof(data_arg.data->byte);
+		else if ((data_arg.size == I2C_SMBUS_WORD_DATA) || 
+		         (data_arg.size == I2C_SMBUS_PROC_CALL))
+			datasize = sizeof(data_arg.data->word);
+		else /* size == smbus block, i2c block, or block proc. call */
+			datasize = sizeof(data_arg.data->block);
+
+		if ((data_arg.size == I2C_SMBUS_PROC_CALL) || 
+		    (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || 
+		    (data_arg.read_write == I2C_SMBUS_WRITE)) {
+			if (copy_from_user(&temp, data_arg.data, datasize))
+				return -EFAULT;
+		}
+		res = i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+		      data_arg.read_write,
+		      data_arg.command,data_arg.size,&temp);
+		if (! res && ((data_arg.size == I2C_SMBUS_PROC_CALL) || 
+		              (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || 
+			      (data_arg.read_write == I2C_SMBUS_READ))) {
+			if (copy_to_user(data_arg.data, &temp, datasize))
+				return -EFAULT;
+		}
+		return res;
+
+	default:
+		return i2c_control(client,cmd,arg);
+	}
+	return 0;
+}
+
+static int i2cdev_open(struct inode *inode, struct file *file)
+{
+	unsigned int minor = iminor(inode);
+	struct i2c_client *client;
+	struct i2c_adapter *adap;
+	struct i2c_dev *i2c_dev;
+
+	i2c_dev = i2c_dev_get_by_minor(minor);
+	if (!i2c_dev)
+		return -ENODEV;
+
+	adap = i2c_get_adapter(i2c_dev->adap->nr);
+	if (!adap)
+		return -ENODEV;
+
+	client = kmalloc(sizeof(*client), GFP_KERNEL);
+	if (!client) {
+		i2c_put_adapter(adap);
+		return -ENOMEM;
+	}
+	memcpy(client, &i2cdev_client_template, sizeof(*client));
+
+	/* registered with adapter, passed as client to user */
+	client->adapter = adap;
+	file->private_data = client;
+
+	return 0;
+}
+
+static int i2cdev_release(struct inode *inode, struct file *file)
+{
+	struct i2c_client *client = file->private_data;
+
+	i2c_put_adapter(client->adapter);
+	kfree(client);
+	file->private_data = NULL;
+
+	return 0;
+}
+
+static struct file_operations i2cdev_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.read		= i2cdev_read,
+	.write		= i2cdev_write,
+	.ioctl		= i2cdev_ioctl,
+	.open		= i2cdev_open,
+	.release	= i2cdev_release,
+};
+
+static void release_i2c_dev(struct class_device *dev)
+{
+	struct i2c_dev *i2c_dev = to_i2c_dev(dev);
+	complete(&i2c_dev->released);
+}
+
+static struct class i2c_dev_class = {
+	.name		= "i2c-dev",
+	.release	= &release_i2c_dev,
+};
+
+static int i2cdev_attach_adapter(struct i2c_adapter *adap)
+{
+	struct i2c_dev *i2c_dev;
+	int retval;
+
+	i2c_dev = get_free_i2c_dev(adap);
+	if (IS_ERR(i2c_dev))
+		return PTR_ERR(i2c_dev);
+
+	devfs_mk_cdev(MKDEV(I2C_MAJOR, i2c_dev->minor),
+			S_IFCHR|S_IRUSR|S_IWUSR, "i2c/%d", i2c_dev->minor);
+	dev_dbg(&adap->dev, "Registered as minor %d\n", i2c_dev->minor);
+
+	/* register this i2c device with the driver core */
+	i2c_dev->adap = adap;
+	if (adap->dev.parent == &platform_bus)
+		i2c_dev->class_dev.dev = &adap->dev;
+	else
+		i2c_dev->class_dev.dev = adap->dev.parent;
+	i2c_dev->class_dev.class = &i2c_dev_class;
+	i2c_dev->class_dev.devt = MKDEV(I2C_MAJOR, i2c_dev->minor);
+	snprintf(i2c_dev->class_dev.class_id, BUS_ID_SIZE, "i2c-%d", i2c_dev->minor);
+	retval = class_device_register(&i2c_dev->class_dev);
+	if (retval)
+		goto error;
+	class_device_create_file(&i2c_dev->class_dev, &class_device_attr_name);
+	return 0;
+error:
+	return_i2c_dev(i2c_dev);
+	kfree(i2c_dev);
+	return retval;
+}
+
+static int i2cdev_detach_adapter(struct i2c_adapter *adap)
+{
+	struct i2c_dev *i2c_dev;
+
+	i2c_dev = i2c_dev_get_by_adapter(adap);
+	if (!i2c_dev)
+		return -ENODEV;
+
+	init_completion(&i2c_dev->released);
+	devfs_remove("i2c/%d", i2c_dev->minor);
+	return_i2c_dev(i2c_dev);
+	class_device_unregister(&i2c_dev->class_dev);
+	wait_for_completion(&i2c_dev->released);
+	kfree(i2c_dev);
+
+	dev_dbg(&adap->dev, "Adapter unregistered\n");
+	return 0;
+}
+
+static int i2cdev_detach_client(struct i2c_client *client)
+{
+	return 0;
+}
+
+static int i2cdev_command(struct i2c_client *client, unsigned int cmd,
+                           void *arg)
+{
+	return -1;
+}
+
+static struct i2c_driver i2cdev_driver = {
+	.owner		= THIS_MODULE,
+	.name		= "dev_driver",
+	.id		= I2C_DRIVERID_I2CDEV,
+	.flags		= I2C_DF_NOTIFY,
+	.attach_adapter	= i2cdev_attach_adapter,
+	.detach_adapter	= i2cdev_detach_adapter,
+	.detach_client	= i2cdev_detach_client,
+	.command	= i2cdev_command,
+};
+
+static struct i2c_client i2cdev_client_template = {
+	.name		= "I2C /dev entry",
+	.addr		= -1,
+	.driver		= &i2cdev_driver,
+};
+
+static int __init i2c_dev_init(void)
+{
+	int res;
+
+	printk(KERN_INFO "i2c /dev entries driver\n");
+
+	res = register_chrdev(I2C_MAJOR, "i2c", &i2cdev_fops);
+	if (res)
+		goto out;
+
+	res = class_register(&i2c_dev_class);
+	if (res)
+		goto out_unreg_chrdev;
+
+	res = i2c_add_driver(&i2cdev_driver);
+	if (res)
+		goto out_unreg_class;
+
+	devfs_mk_dir("i2c");
+
+	return 0;
+
+out_unreg_class:
+	class_unregister(&i2c_dev_class);
+out_unreg_chrdev:
+	unregister_chrdev(I2C_MAJOR, "i2c");
+out:
+	printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__);
+	return res;
+}
+
+static void __exit i2c_dev_exit(void)
+{
+	i2c_del_driver(&i2cdev_driver);
+	class_unregister(&i2c_dev_class);
+	devfs_remove("i2c");
+	unregister_chrdev(I2C_MAJOR,"i2c");
+}
+
+MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
+		"Simon G. Vogl <simon@tk.uni-linz.ac.at>");
+MODULE_DESCRIPTION("I2C /dev entries driver");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_dev_init);
+module_exit(i2c_dev_exit);